Revalidation and re-registration

Hi,

I gave my last attempt of CA final in November 2018. After that I quit and joined a company. But now I want to finish it. But I'm confused that whether I can revalidate online or I need to approach the centre to do the same?

Second: Will this revalidation automatically make me to appeae for the new course or I have to appear fot the old one only??

Third: How to convert from old course to new course after my revalidation is done.

Thank you in advance for your time and generosity.